TTM20172016201520142013
Gross margin55.3%55.4%55.4%53.7%53.5%51.7%
Gross margin growth (bps)-44-20-2018187-74
Operating margin5.3%6.0%6.0%6.0%4.4%3.1%
Operating margin growth (bps)-94-55-55159133123
Net profit margin3.2%4.0%4.0%4.7%2.7%1.6%
Net profit margin growth (bps)-423737201114-832